申请人:Canon Kabushiki Kaisha
公开号:US05217645A1
公开(公告)日:1993-06-08
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a linear or branched alkyl group having 2-16 carbon atoms capable of including one or non-neighboring two methylene groups which can be replaced with --O--, --S--, --CO--, --COO-- or --OCO-- and capable of including a hydrogen atom which can be replaced with a fluorine atom; A denotes --A.sub.1 -- or --A.sub.1 --A.sub.2 --; B.sub.2 denotes --B.sub.3 -- or --B.sub.3 --B.sub.4 --; A.sub.1, A.sub.2, B.sub.1, B.sub.3 and B.sub.4 independently denote ##STR2## wherein Y.sub.1 and Y.sub.2 independently denote a hydrogen atom, F, Cl, Br, --CH.sub.3, --CN or --CF.sub.3, with the proviso that B.sub.1 can be a single bond; Z.sub.1 and Z.sub.2 independently denote a single bond, --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --; Z.sub.3 denotes --O--, --CO--, --COO-- or --OCO--; R.sub.2, R.sub.3 and R.sub.4 independently denote a linear or branched alkyl group having 1--16 carbon atoms capable of including one or two methylene groups, other than those directly connected to Si, which can be replaced with --O--, --COO-- or --OCO-- with the proviso that --O-- cannot directly be connected to --O--; 1 and m independently denote 0 or 1 with the proviso that 1+m.noteq.0; n is an integer of 1-12; and X and Q independently denote CH or N with the proviso that X and Q cannot be N simultaneously. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.
由以下公式(I)表示的一种中肌肉化合物:其中R.sub.1表示具有2-16个碳原子的线性或支链烷基基团,可包括一个或非相邻的两个亚甲基基团,可用--O--,--S--,--CO--,--COO--或--OCO--替换,并且可以包括一个氢原子,可用氟原子替换;A表示--A.sub.1--或--A.sub.1--A.sub.2--; B.sub.2表示--B.sub.3--或--B.sub.3--B.sub.4--; A.sub.1,A.sub.2,B.sub.1,B.sub.3和B.sub.4独立地表示其中Y.sub.1和Y.sub.2独立地表示氢原子,F,Cl,Br,--CH.sub.3,--CN或--CF.sub.3,条件是B.sub.1可以是一个单键;Z.sub.1和Z.sub.2独立地表示单键,--COO--,--OCO--,--CH.sub.2 O--或--OCH.sub.2--; Z.sub.3表示--O--,--CO--,--COO--或--OCO--; R.sub.2,R.sub.3和R.sub.4独立地表示具有1-16个碳原子的线性或支链烷基基团,可以包括一个或两个亚甲基基团,除了直接连接到Si的那些基团,可以用--O--,--COO--或--OCO--替换,条件是--O--不能直接连接到--O--;1和m独立地表示0或1,条件是1+m不等于0;n是1-12的整数;X和Q独立地表示CH或N,条件是X和Q不能同时为N。这种中肌肉化合物对于提供显示改善的低温操作特性和减少响应速度温度依赖性的铁电液晶组合物是有效的。